Steam-generator.



N0. 845,885V PATBNTED MAR. 5, 1907. J. A. MUMFORD z D. W. ROBB.

STEAM GENERATOR.

ArrmoA'rroN rum) nu 22. 190s.

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- L PATENTED MAR. 5, 1907. .J. A. MUMPORD a D. W. ROBB.

STEAM GENERATOR; A

nrmoulon mm nu gz. 190s.

3 SHEETB-SHEET 2.

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do @v-66% t i f i 111ml. -LLLLlij 4 n PATBNTED MAR. 5, 1907. J. il. MUMPORU L D. w. ROBE.

STEAM GENERATOR.

APPLIOAZ'ION FILED HAY 22. 1908.

3 SHEETS-SHEET 3.

UNITED STATES VIfLYIEI OFFICE.

STEAM-GENERATOR.

Specification of Letters Patent.

Patented March 5, 1907.

Application filed May 22,1966. Serial No, 318,194.

To 11]/ offro/11 it my erinnern:

' Beit known that we,^Josnrn A. MUMFORD, of Roslyn, in the eountj of Nassau and State of New York, and l).\vin W. ltonn, of Amherst, Province of Nova Scotia, Dominion of arranged in an inclined position in the furnace-setting und at their ends open into or communicate with suitable drums and headers, :is is well understood in this nrt.

rl`he invention consists in certain novel details of construction and combinations and arrangements of parts, whereby increased eilieiene) is secured, tbe shells oi' the drums and headers strengthened, and distortion and raz-king of the parts due to expansion and eontrnetion to a large extent overcome.

Referring to the aecompaxrving drawings, Figure. 1 isa vertical section through a steamgclnrator :ind its setting embodying the present improvements, eert-nin parts lheilig shown in elevation. Fig. '.2 is a detail section through a portion of the front drum and its depending header for thtI lower bank of tubes. lig. 3 is a detail front elevation of a portion of the front drum and header, portions of the front shell of eneh being broken away to show the internal construction. Fig. 4 is a view corresponding to Fig. l. but with a slightly-nndiiied construction of the drums.

ln said drawings the letter A indicates the boiler-setting, which, :is usual, is made in the form of a combustiou-elmmber, within which the .steam-generator is located and supported, the furnace-grate and bridge-wall l5 and C,

. At the rear of the settin respectively, being located in the lower portion of the setting and near the forward end ofthe same. bese parts may all be of any usual or preferred type and rovided with the usual clean-out and fuel) and ash-pit doors. T wo drums D and E are located in the upper portion of and at front and rear, respectively, of the setting, the center line of one of said drums, preferably that at the back of the. setting land lettered E, being somewhatabove the cent-er of the forward drum, (lettered D.) Thus the drum E becomes the steam-drum, from which the steam may be withdrawn through a suitable outlet, such as e. The drums E and D are connected b v two sets of pipes or tubes F and 1"', the former :being preferably located above thcwater-level to serve as steam-passages and as steam-su ierheaters, while the latter are located below the water-level and serve as a `part of the water-circulating system of the generator.

A and below the drum E are located two a ditional drums G and II, )referably of similar formation and arranged parallel to and one above. the other. The upper one of these drums, that lettered G. is connected, with theI forward drum D by :thank et tubes I, and the lower one, I'I,iscon nected with a header L by a bank of tubes K, the said header L being in turn connected at its upper edge with the lower portion of the drum l), so as to form an integral extension thereof, it being understood that suitable conimunicatinff openings are formed in the shell of the drum D for opening communication between the` header and drum. The banks of tubes I and K are inclined downwardly from the front of the Generator at such an angle as to secure the best circulation and action of the heated pruducts of combustion thereon. In order to give a prolonged action bbv said products on the tubes, suitably-inclined partitions r and 'i are located above the respective banks of tubes K and I, the former partition lc being extended from the header L diagonally downward to ward the reanof the generator and the latter )artition 'i being extended from the drum G 1n an upwardly-inclined direction toward the RoBB, or

front of the generator, whereby the products l the body of the setting in'aceordance with of combustion are first caused to traverse l the space to be found between the tube-openpractieallvthe fulllengthof the lower bank of ings. Thus in said Fig, 3 it will be noted tubes and then traverse practically the full i that the flange g is on one side of the body of length of the uppei' bank of tubes and finally to pass. through the upper portion of the settint:r around the tubes l" and it" and beneath located on the opposite side of the body of f the stay, where sufficient room is found for the drum ll to the smoke-outlet )lat the rear of the setting.

The drnins E. (i. and li are connected b v substantially vertical tubes, preferabl arranged in independent sets N and O. Thus each of the banks of tubes l and K, together with its dr'im G or ll, constitutes part of a se arate circulating system, and each set of I tu es,with itsdrum (lor il, is free to expand I and contract4 independentliv of the other set without causing distortion or racking of the tubes or generator connections.

The drums and ll constitute mud-drums Afor the collection of sediment, and they are therefore each provided with blow-off i es I.

Vhile the drums D, G, and Il may be cylindrical drums, as shown in Fig, 4, and the ends of the tubes connecting therewith hentto enter said drums radially, in the preferred construction thc said drnnis are provided with flat faces in which the tube-o enings are formed, such faces being indicate( in Fig. 1 bv the letters d, g, and li., respectively. With this construction it is highly desirable that the flat faces shall be braced and strengthened to approximate in strength the c linilrical portions of the drums without t e necessity of employing heavier metal in the flattened portions. To accomplish this successfully and ut the same time permit of the employment of the maximum number of tubes in staggered relation to eac-h other, so that the rodncts of combustion will be forced to ollow a tortuous path in passing throu h between the tubes, we now make use ofgsinuous stays which are riveted to the inner faces of thel flattened portions of' the drums.

The snuous formation of the stays permits them to pass between the ends of the tubes or openings for the ends of the tubes without coming into sncli proximity thereto as to interfere either with the heading of the tubes or the cleaning of the same after the generator is in use.- In the preferred construction these sinuous stays, aswell illustrated in Figs. 1 and 3,are formed of flanged metal. Thus the sinuoushodv of the stays is indicated-hv the letter Q, and the flanges on said stays are ,l

cated at S.

indicated by the letter q and g. ln order to provide for the employment of wide flanges I somewhat rcmovrd from tbc Lottum ol' the which may be riveted to the face of the drinn and at the sinne time avoid interference with the ends of the tubes or tube-openings, the

fianges are formed on one side or the other of the stay, where sufficient room is found for the rivets. and the flange q', which is interniedlate th(` two portions of the flange q, is

the location of its rivets. while opposite the flange y' and between the sections of the f flange Q a space is left for one of the tubes.

From the foregoing it will be seen that the staggered arrangement of tubes is used in connection with a staggered or sectional arrangement of the flanges on the stays, whereb v each will perform its functions without interfering with the other and at the same time the maximum strength in the drum 'may be secured.

The hea-der l., which depends from the drum l). is preferably formed of plat'.` metal bent into substantially U -forni in crosssection, but with parallel side walls, and

the` bank of tubes li enters this header in the inner side wall.` The outer face or wall 0f the header is provided with the usual hand-holes l, and in order to brace and strengthen the'lzeadrr to correspond to the strength of the other portions of the generator the two sidewalls are connected togrther by sinuous stays lt, which correspond in construction very elosel;v to the stays Q hereinbeforc described-that is to say. the bod)v of each stay is made sinroils to pass the staggered ends of the tubes and the opposite edges of the body of the sta)v are flanged, as shown clearly in Figs. 2 and 3, and united rigidly to the two opposite walls of the header by rivets. The flanges on the stays R are div-.ded into ser-tions, which extend alternately in opposite directions, as shown at r and r', the staggered arrangement of the flanges corresponding to the staggered arrangement of the. tubes. Thus each flange-section projects into the space between tubes, which are in the same vertical plane, where ample space is found for the attaching-rivets witiioizt un.Y

due weakening of the shell, and wit-hout in any wise interfering with or' obstruct-ing the tube-openings.

In the preferred construction the stays lt, in addition to being .secured to the walls of the header, are also srcnred tothe shell of the drum l). Thus, as shown in said Figs. .Z and 3, the upper end of each stay is flanged and united to the said shell l-.v rivets. as indi- The lower end of each staiI prcfcrahl'w header; therety providing :i small circulating-space under each stay, and :it tu same time this space does not permit of the circuv cate and separate drums at the lower rear 4o lation of a. volume of water equal to the capacity of thc tubes between the stays or between the endlicad and lirst stay. tule a circulation will be nuiintauud under all onclitionsin all of the tubes, nevertheless the i circulation will be augmented in those tubes i subject tothe `greatest heatingr cih-ct ol' the. products of combustion, and conseqtienth not only will the generation o' steam be increased, but the tubes willl be prevented l from being burned out where subjected to the direct action of the products of combustion.

While all of the drums may be provided with hand-ho1es or marit-oies, as is usual in boilers of this class7 it is preferred. to locate the manhole D in the, drum I) opposite. to the tube-openings, thas providing for the ready cleaning ot the tubes.

In the preferred construction shown in the drawings the entire qenerator, inchidinpr its drums and header, is located `within they wal o the setting, the only portions exposed in the exterior being the 'manholes D ot the front drum; but in the said settingr and opposite the band-holes l of the header there. is provided a door or cover-plate T for giving.; access to the said header, whereby repairs and cleaningl :nay-he e'll`ected without cutering or disturbing the setting.

loving thus described our invention, what g we claim as new, and desire to secure by Letters Patent, is t 1. 1n a steam-generator, the combination z i l l Wit-h the two independent, banks of inclined Watcrtubes located one above the other, a drum at the upper forward ends olsaid banks i of tubes and with which the)Y both communiends of' said tubes, each bank being in communication with its own separate druin whereby each bank is free to expand and contract in(lepcadenti;r of the othenof an upper rear drum locate( ipproxiinateljr over the said lower rear drums, independent circulating-tubcs connecting said lower rear drums and the upper drum whereby they may expand and contra-et. indcpeiulently,' and circulating-tubes connecting toe reari and forward upper drums said last-inentioned tubes being independent of both the banks of tubes and vertically-arranged ciri culating-tubes and the whole arrzmgement-A being: such that longitudinal expansion and j contraction of any set of tubes is not resisted l by the longitudinal resistance of any other L set of tubes.

:2. ln a :team-generator, the combination with a bank of tubes, the several tubes being: staggered 'with relation to each other and a water-chamber into which said tubes` enter, of a sinuous stay secured to the inner face of said water-chamber between the entranceopinions of the tubes; substantially as described ln u steauefgeperntor. the combination with a bank of tubes, the several tubes ot' said bank lain; staggirid with relation to each other. ol' a wat( r-cinunber into which the ends of said tubes ruler and a {langt-d l sinuou,`l sta)y secured to the inner face ol said cha inberbct wenn becntra nce-oprningsof the tubes; .'s'ubstautiall \Y as described.

4. ln a .stenlil-generator, a bank of tubes wherein the several tubes are staggered with relation lo each other, of a water-chamber into which the ends ol' said tubes enter and a. sinuous stay secured lo the inner face of said chamber between the entrance-openings of the tubes and o]positch-projecting sectional llanges on said .stay for securing the same. in

position' between the tube-openings; sub-v with the arrangementol` the tubes, for securin t;r thi` stay in position between the tubeopenings; substantially as described.

G. In a steafir-generator, the combination with a bank of tubes, wherein the tubes are staggered with relation to each other, of a druni havin`r a flat face into which the ends .of said tubes are entered and a separate sinuous sta)i secured to the inner side of said flat fai-,e between tlnI entrance-openings of the tubes; substantially as described.

7. ln a steam-gcnerator, the combination with a. bank of tubes wherein the tubes are staggered with relation to each other, of 'a druni havingl a llat face into which the ends ot' said tubes are entered and a sinuous sta-y secured in position against the inner side of said flat face, said Stay having oppositelyprojecting sectional flanges for securingr it 111 position; substantially as described.

8. [n a stea1x1-generator, the combination with a bank ottubes' wherein the tubes are staggered with relation to each other, of a Hat-faced header into one. face of which said ends of said tubes are entered, hand-holes in the other face of said leader opposite the. tube-entrancesI and *langed sinuous stays IOC IOS

IIO

.with a bnnk of tuhcs whorcin thc Lubes are sffiggercd with relation to cnchothrr, of u Hat-faced houder into omx faccof which the ends of said tubos are entered, hand-holas in the other of said faces opposite thc tubo-m1- trnnces und slnuous stays ha-vlng uppositclyproject-111g sectional ihuigr-s united to the 0pl nosite. faces of the headerintermedite the i mnd-holes and tube-entrances; substantially as described.

JOSEPH A. MUM FORD. DAVID W. ROBB.

Witnesses as to J osoph A. Mumford:

C. A. Fox,

M. L. PATCH. "itncsscs as to David W'. Robb: y GEO. ROYAL CL'LNFER, 1 MARGARET BERMINGHAM. 

